. >>> our big story, three days after e-cia director david petraeus resigned following his admitted affair with his buying on ferreira, more questions arrived. >> congress is demanding answers wondering why they weren't told sooner. melanie alnwick has the latest on this story. >> reporter: tuesday, while all of america was focused on the election, behind the scenes, cia director david petraeus is being advised to resign as his affair was about to become very public and now members of congress are asking questions about the timing. david petraeus and paula broadwell first met in the spring of 2006. four years later, a dissertation written by broadwell about the four-star general developed into something much more. >> i had been working on this project as my dissertation and when he went to afghanistan in the summer of 2010, i decided it turn it into a book. i shot him an e-mail and said i'm going to go for it. i showed up in afghanistan. >> reporter: the fbi discovered at fair between petraeus and broadwell while the agency was investigating harassing e-mails allegedly sent by broadwell to